DNS zone name cannot be specified

[Nobuto Murata]

DNS zone name, more specifically "name" in node-group definition below, cannot be changed with deployment.yaml.

[maas maas node-group update -h]
====
:param name: The new DNS name for this cluster.
:type name: unicode
====

I believe it's a common need to specify DNS zone name to comply network requirement defined in a organization. Currently "maas"(default) is used for the zone name.

2015-07-28 07:26:38,973 DEBUG (execc) Executing: 'ssh -i /home/nobuto/.ssh/id_maas -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o LogLevel=quiet ubuntu@10.230.123.52 maas maas node-groups list' stdin=None
2015-07-28 07:26:40,136 DEBUG (_maas_execute) Command executed successfully: stdout='[
    {
        "cluster_name": "Cluster master",
        "status": 1,
        "name": "maas",
  ...'